TABLE 2.

Steady-state K_D measurements

Mean ± S.E. n ≥ 3 (number of protein preparations) is shown.

	+ 1 mm ATP		No ATP
	+ 0 mm KCl	+ 100 mm KCl	+ 0 mm KCl
PS	6.6 ± 0.7 μm (3)	11.6 ± 2.0 μm (3)
PSC1a	0.23 ± 0.04 μm (3)	0.23 ± 0.06 μm (4)
PSC1aC1b	0.059 ± 0.013 μm (3)	0.082 ± 0.044 μm (3)
PSC1aC1bC2	0.0039 ± 0.0028 μm (3)	0.0045 ± 0.0023 μm (4)	4.9 ± 0.7 μm (5)
PSC1a–C2	0.17 ± 0.04 μm (3)
PS–C1bC2	2.6 ± 0.4 μm (4)